How to calibrate the PH meter is simply dipped in a liquid PH sachet.
If you don't need a lot of calibration, then this calibration liquid is most suitable for calibrating the ph meter.
This calibration tool consists of 2 types of sachets PH 4.01 & pH 7.01 in 1 box consisting of 2 sachets. Perform regular calibrations to ensure the accuracy of your PH meter. This calibration fluid is easy to carry in a pocket, very suitable for measurements far from the laboratory.